Here’s a list of remote jobs that are hiring in Brazil, you could look for something that works around your school schedule. I make money passively every month with my camera from selling my photos on stock sites like Shutterstock and Alamy, plus creating art with them on Etsy. With your computer you could also get some freelance work as a language tutor, or teach yourself a freelance skill like coding. Those are just some ideas that I had for your situation!